Mithrandir Metrics
NYM 2026-07-05 Refreshed Sep 2 06:00 AM ET
Section III · Betting · Player detail · 2026-07-05

Mark Vientos

NYM · Hitter · bats R · age 27
IN · 6 Positive regression Neutral
MatchupNYM vs ATLMartín Pérez
Sample1326.0career MLB AB
PROPS 3 available PERCENTILES 23 rows LINEUPS confirmed artifact NO PROSE templated rows only
Strikeouts · Palantir calibration review Last 14d ECE 0.053, 14d stable. This flags probability calibration, not a blanket model failure.
Strikeouts · Valinor calibration review Last 14d ECE 0.068, 14d stable. This flags probability calibration, not a blanket model failure.
Total Bases · Palantir calibration review Last 14d ECE 0.053, 14d error rising. This flags probability calibration, not a blanket model failure.
Tonight's props · all markets for this player
Home Run 0.5
P 14.5
F 14.5
V 13.5
Model 19.0% Market 16.0% Gap +2.3pp
FanDuel 500 tracking Open board
Total Bases 0.5
P 58.0
F -- in progress
V -- in progress
INSUFFICIENT LANES
Model 58.0% Market 73.7% Gap +11.6pp
FanDuel 110 tracking Open board
Hits 1.5
P 20.7
F -- in progress
V -- in progress
INSUFFICIENT LANES
Model 20.7% Market -- Gap +8.7pp
FanDuel 240 tracking Open board
RBI --
RBI · no production board

No production board publishes this player-market cell today.

Underlying skill · actual percentile with projection tick

Percentile strip

100th = best in MLB
Hitting · percentile strip
Barrel%7.3%
79
Exit velocity89.8
70
Hard-hit%44.0%
71
xBA0.315
41
xSLG0.596
74
xwOBA0.306
48 -20 vs proj
BB%4.6%
11 -20 vs proj
Bat speed71.7
76
K%23.8%
41
Defense · percentile strip
Arm Strength85.4 · 1B
44
Outs Above Avg-8.0 · 1B
2
Range Runs-5.6 · 1B
7
Baserunning · percentile strip
Sprint Speed25.7 · 1B
13
Mithrandir+ · percentile strip
Avoids Bad ChasesST 59.8%
23
Avoids Bad TakesHPT 20.7%
86
Correct Decisions66.4%
53
SEAGER+ Plate Discipline100
43
Resists Breaking - horizontalwOBA 0.273 · small sample
small sample
Resists Breaking - verticalwOBA 0.280 · thin sample
thin sample
Resists ChangeupwOBA 0.303
Small sample
Resists Cutters + splitterswOBA 0.339 · thin sample
thin sample
Resists FastballwOBA 0.315
Small sample
Resists SinkerwOBA 0.342
Small sample

Context

projection · regression · matchup
Projected range0.300 to 0.377
RegressionPositive · 0.020
Opposing pitcherMartín Pérez
EnvironmentNeutral
Lane calibration receipts
Lane Health 2026-09-02
Palantir 18081 props Brier 0.118 ECE 0.008 14d stable
Fangorn 18081 props Brier 0.118 ECE 0.009 14d stable
Valinor 12423 props Brier 0.112 ECE 0.004 14d stable
Palantir 1591 props Brier 0.247 ECE 0.006 14d stable
Fangorn 53 props Brier 0.257 ECE 0.119 sample building
Valinor 1087 props Brier 0.248 ECE 0.016 14d stable
Palantir 8613 props Brier 0.238 ECE 0.047 14d error rising
Fangorn tracking in progress (0 logged)
Valinor tracking in progress (0 logged)
Palantir 683 props Brier 0.163 ECE 0.031 14d stable
Fangorn tracking in progress (0 logged)
Valinor tracking in progress (0 logged)
Palantir 900 props Brier 0.256 ECE 0.059 14d error falling
Fangorn tracking in progress (0 logged)
Valinor tracking in progress (0 logged)
Palantir tracking in progress (0 logged)
Fangorn tracking in progress (0 logged)
Valinor tracking in progress (0 logged)